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Method for preparing lithium iron phosphate serving as cathode material of nano-level lithium ion battery

A lithium ion battery, lithium iron phosphate technology, applied in battery electrodes, nanotechnology, nanotechnology and other directions, can solve the problems of unsatisfactory performance of lithium iron phosphate, poor carbon coating effect, low conductivity, etc., to simplify The effect of production process and equipment investment, easy control of process parameters, and high electronic conductivity

Active Publication Date: 2012-06-27
连云港华海诚科电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The performance of lithium iron phosphate prepared by this method is not ideal, and the carbon coating effect is not good. The reason is that this method adds carbon source after the first sintering. Lithium particles have been preliminarily formed. At this time, the particles are basically solid. It is difficult for the carbon deposited in the second and third sintering to penetrate into the particles, but can only be deposited on the surface of the particles, so it is easy to Detached from lithium iron phosphate, the conductivity of the material remains low due to the lack of carbon doping inside the particles

Method used

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  • Method for preparing lithium iron phosphate serving as cathode material of nano-level lithium ion battery
  • Method for preparing lithium iron phosphate serving as cathode material of nano-level lithium ion battery
  • Method for preparing lithium iron phosphate serving as cathode material of nano-level lithium ion battery

Examples

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Embodiment 1

[0030] Embodiment 1, a kind of preparation method of nano-lithium ion battery grade positive electrode material lithium ferrous phosphate, its steps are as follows:

[0031] (1) The composite carbon source raw material is added into an organic solvent to disperse evenly to obtain a composite carbon source solution; the composite carbon source raw material is selected from sucrose, glucose, fructose, sorbose, cellulose acetate, ascorbic acid, cyclodextrin, soluble A composition of at least two of starch, edible oil, citric acid, polyvinyl alcohol, polypropylene alcohol, furyl alcohol, resorcinol, phenolic resin, and epoxy resin; the composition contains at least one with a molecular weight of 100~ 10,000 organic small molecule carbon sources, containing at least one organic polymer carbon source with a molecular weight of 10,000 to 500,000, and the added amount of the organic small molecule carbon source is 1%wt of the final theoretical carbon of lithium iron phosphate, the orga...

Embodiment 2

[0035] Embodiment 2, a kind of preparation method of lithium ferrous phosphate of nanometer lithium ion battery grade cathode material, its steps are as follows:

[0036] (1) The composite carbon source raw material is added into an organic solvent to disperse evenly to obtain a composite carbon source solution; the composite carbon source raw material is selected from sucrose, glucose, fructose, sorbose, cellulose acetate, ascorbic acid, cyclodextrin, soluble A composition of at least two of starch, edible oil, citric acid, polyvinyl alcohol, polypropylene alcohol, furyl alcohol, resorcinol, phenolic resin, and epoxy resin; the composition contains at least one with a molecular weight of 100~ 10,000 organic small molecule carbon sources, containing at least one organic polymer carbon source with a molecular weight of 10,000 to 500,000, and the added amount of the organic small molecule carbon source is 3%wt of the final theoretical carbon of lithium iron phosphate, the organic...

Embodiment 3

[0040] Example 3, in step (1) of the preparation method described in Example 1 or 2, the organic solvent is selected from one or a mixture of ethanol, isopropanol, and acetone.

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Abstract

The invention discloses a method for preparing lithium iron phosphate serving as a cathode material of a nano-level lithium ion battery. The method is characterized by comprising the following steps of: adding a composite carbon source into a solvent, and uniformly dispersing; mixing a lithium source, iron source and phosphorus source compound and the composite carbon source, putting the mixture into a ball grinder for grinding to obtain slurry; drying and smashing the slurry to obtain a precursor; calcining the precursor under a protective atmosphere; and along with the thermal cracking of the carbon source compound, coating a layer of carbon source on a crystal to form a carbon-coated film with relatively high graphitized crystallinity at high temperature, and thus obtaining the lithium iron phosphate with a carbon composite olivine structure. According to the lithium iron phosphate cathode material prepared by using the method, the chemical constituent, the phase composition and the particle size of the LiFePO4 can be controlled effectively; the primary particle size of the LiFePO4 is 20 to 600 nanometers; and the LiFePO4 has relatively high electronic conductivity and relatively high specific capacity.

Description

technical field [0001] The invention relates to a preparation method of lithium iron phosphate, a cathode material of nanoscale lithium ion battery, and belongs to the technical field of preparation of electrode materials. Background technique [0002] In 1997, the Goodenough research group reported for the first time that lithium iron phosphate with an olivine structure could reversibly intercalate and deintercalate lithium ions, which attracted great attention. After batteries are used as positive electrode materials, LiFePO4 materials have the characteristics of non-toxic, non-polluting, good safety performance, wide range of raw material sources, large capacity, and good stability. It is currently a hot spot for development and research in the battery industry. However, the pure LiFePO4 material has its own shortcomings, such as poor electrical conductivity, which limits its commercial application. [0003] In order to realize the practical application of lithium iron p...

Claims

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Application Information

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IPC IPC(8): H01M4/58B82Y30/00B82Y40/00
CPCY02E60/12Y02E60/10
Inventor 韩江龙陶军顾涛方汉章王志李兰侠
Owner 连云港华海诚科电子材料有限公司
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